QUANTUM · Section
Excitons in quantum information — single-photon sources, polariton qubits and simulators, coherence, and room-temperature quantum platforms.
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Fault tolerance requires millions of physical qubits, error rates below threshold, and measurement-based correction. Excitonic systems have demonstrated none of these at scale — which is why their near-term role is simulation, not universal computation.
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No single qubit technology does everything well. Hybrids use excitons as the interface — converting photons to spins, microwaves to optics — while longer-lived qubits do the remembering.
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Cryogenics buys coherence, purity, and precision. Room temperature buys deployability, cost, and scale. Excitonic quantum technology must choose — and the right choice depends on the application.
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Every excitonic quantum proposal lives or dies by the ratio of coherence time to operation time. This is the number to ask for first — and the one most often quoted without its context.
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Entangled photon pairs from biexciton cascades are real. Entanglement between distant exciton qubits is not yet a mature technology. The difference between those statements is the state of the field.
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Exciton-polaritons can condense into a single macroscopic quantum state and be patterned into lattices. That makes them a natural platform for simulating quantum many-body physics — not for running Shor's algorithm.
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A single exciton recombining emits a single photon — in principle. Turning that fact into a source good enough for quantum optics requires mastering purity, indistinguishability, and brightness at once.
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An exciton is a bound electron-hole pair that behaves, in some respects, like an atom made of light and matter. Whether it can serve as a qubit depends on which quantum properties survive contact with a real crystal.